#include <iostream>
#include <cstdlib>
#include <vector>
#include <algorithm>   //for find
using namespace std;

int main()
{
	int a[] = {10, 20, 30, 40, 50};
	size_t n = sizeof a / sizeof a[0];
	vector<int> v(a, a + n);

	int *p1 = find(a, a + n, 20);
	int *p2 = find(a, a + n, 40);
	ptrdiff_t d1 = p1 - p2;

	cout << "The distance between 20 and 40 is " << d1 << ".\n";
	p2 += d1;
	cout << "Now p2 points to " << *p2 << ".\n\n";

	vector<int>::iterator it1 = find(v.begin(), v.end(), 20);
	vector<int>::iterator it2 = find(v.begin(), v.end(), 40);
	vector<int>::difference_type d2 = it1 - it2;

	cout << "The distance between 20 and 40 is " << d2 << ".\n";
	it2 += d2;
	cout << "Now it2 refers to " << *it2 << ".\n";

	return EXIT_SUCCESS;
}